8034223: Most-specific should not have any special treatment for boxed vs. unboxed types

Rewrite most-specific logic to conform to JLS 8 15.12.2.5

Reviewed-by: vromero

langtools/test/tools/javac/lambda/MostSpecific11.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 8034223
+ * @summary Return type Object is not more specific than return type String
+ * @compile MostSpecific11.java
+ */
+class MostSpecific11 {
+
+    interface I { Object run(); }
+    interface J { String run(); }
+
+    void m(I arg) {}
+    void m(J arg) {}
+
+    void test() {
+        m(() -> { throw new RuntimeException(); });
+    }
+
+}